Definition
The NBBO is the consolidated view of the top-of-book bid and offer across all visible, protected Canadian marketplaces (TSX, TSX Venture, NEO, CSE, and others). Under UMIR 5.1, dealers are expected to consider the NBBO when assessing whether best execution has been achieved for a client order. An order executed outside the NBBO (at a worse price than the national best) must be justified by factors such as immediate liquidity needs or block-size constraints. The NBBO is relevant for best price obligations (UMIR 5.2) that apply to protected orders - a limit order on a marketplace must be executed at or better than the NBBO before trading at a worse price is permitted.
Source
UMIR 5.1, 5.2; NI 23-101
Where this shows up on the CIRE
- Outcome 8.1